Systems and methods involving balancing currents for thyristors
a technology of thyristors and current balances, which is applied in the field of measuring the current in thyristors and balancing the current load on thyristor bridge circuits, can solve the problems of thyristors to tail prematurely, current imbalance once the leg, and imbalance of thyristors in legs
Inactive Publication Date: 2009-06-11
GENERAL ELECTRIC CO
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[0005]An exemplary embodiment of the present invention includes a method for balancing thyristor bridge circuits, the method comprising, determining currents of thyristors in a first leg of thyristors of a thyristor bridge circuit determining a first set of gate firing times for the thyristors in the first leg of thyristors responsive to determining the current of the thyristors in the first gate of thyristors, wherein the first set of gate firing times are operative to balance a current load between the thyristors in the first kg of thyristors, and gating the thyristors in the first leg of thyristors according to the first set of gate firing times.
[0006]An exemplary embodiment of the present invention includes an exemplary system for balancing thyristor bridge circuits comprising, a first
Problems solved by technology
When the thyristors in a leg are gated at the same time, there may be a current load imbalance between the thyristors in the leg.
For example, one thyristor of a leg may have contact points closer to a power bus than another thyristor in the leg resulting in a current imbalance once the leg is gated.
A current imbalance may increase the heating of an individual thyristor that may cause the thyristor to tail prematurely.
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[0013]In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments of the present invention. However, those skilled in the art will understand that embodiments of the present invention may be practiced without these specific details, that the present invention is not limited to the depicted embodiments, and that the present invention may be practiced in a variety of alternative embodiments. In other instances, well known methods, procedures, and components have not been described in detail.
[0014]Further, various operations may be described as multiple discrete steps performed in a manner that is helpful for understanding embodiments of the present invention. However, the order of description should not be construed as to imply that these operations need be performed in the order they are presented, or that they are even order dependent. Moreover, repeated usage of the phrase “in an embodiment” does...
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An exemplary embodiment includes a method for balancing thyristor bridge circuits, the method comprising, determining currents of thyristors in a first leg of thyristors of a thyristor bridge circuit, determining a first set of gate firing times for the thyristors in the first leg of thyristors responsive to determining the current of the thyristors in the first gate of thyristors, wherein the first set of gate firing times are operative to balance a current load between the thyristors in the first leg of thyristors, and gating the thyristors in the first leg of thyristors according to the first set of gate firing times.
Description
BACKGROUND OF THE INVENTION[0001]Embodiments of the invention relate generally to power semiconductor converters, and more particularly to measuring the current in thyristors and balancing the current load on thyristor bridge circuits.[0002]In this regard, thyristor bridge circuits connected in parallel include legs. A leg is a group of thyristors wherein each thyristor of the leg occupies a similar position in a thyristor bridge circuit, in operation, each thyristor in a leg is often gated at the same time.[0003]When the thyristors in a leg are gated at the same time, there may be a current load imbalance between the thyristors in the leg. One reason for the current imbalance may, for example, be caused by the geometric differences among each thyristor in the leg. For example, one thyristor of a leg may have contact points closer to a power bus than another thyristor in the leg resulting in a current imbalance once the leg is gated. A current imbalance may increase the heating of a...
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Login to View More IPC IPC(8): H02H7/125H03K17/72
CPCH02M1/088
Inventor PEARSON, WILLIAM ROBERTMONCLOVA, PEDRO
Owner GENERAL ELECTRIC CO